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Low Cost, Compact Microwave Reflectometer for Non-Destructive Testing

Low Cost, Compact Microwave Reflectometer for Non-Destructive Testing. Matthew Rangen and Keith Bruno April 15, 2005 Bradley University Department of Electrical and Computer Engineering. Overview. Objective Background Block Diagram Tasks & Schedule Results MATLAB Network Analyzer.

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Low Cost, Compact Microwave Reflectometer for Non-Destructive Testing

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  1. Low Cost, Compact Microwave Reflectometer for Non-Destructive Testing Matthew Rangen and Keith Bruno April 15, 2005 Bradley University Department of Electrical and Computer Engineering

  2. Overview • Objective • Background • Block Diagram • Tasks & Schedule • Results • MATLAB • Network Analyzer

  3. Objective The objective of the project is to determine the reflection coefficient of an unknown load by the use of a six-port network analyzer integrated with a workstation.

  4. Background The reflection coefficient can be found by knowing a reference signal and sampling selected power outputs in a micro-strip circuit. With these known quantities and using a specific algorithm, the reflection coefficient can be calculated.

  5. Detailed Block Diagram

  6. Tasks & Schedule

  7. Calibration Process The Calibration process is used to find the complex numbers: These numbers are used to find the gamma of an unknown load.

  8. Calibration Process The Calibration process needs two known items to start the process. 1. Gammas of the Known Loads 2. Power Measurements of the Known Loads Once this is known the calibration process may begin.

  9. Calibration Process By taking the power measurements:

  10. Calibration Process By taking the gammas:

  11. Calibration Process Now by combining the two previous steps. + The calibration process then begins to solve:

  12. MATLAB Work Calibration Flowchart

  13. Measurement Process By using the the known complex numbers found from the calibration process, any gamma can be calculated from an unknown load. This process is very simple compared to the calibration process.

  14. Measurement Process The measurement process needs only one known item. 1. Power Measurements from the unknown load Once this is known, the measurement process begins.

  15. MATLAB Work Measure Flowchart

  16. 6-Port Network Analyzer P_two P_three P_four P_one

  17. 90° Hybrid } Input Port Output Port 90° phase-shift difference Isolated Port Output Port

  18. 90° Hybrid

  19. 90° Hybrid Results

  20. 90° Hybrid Results

  21. 90° Hybrid

  22. 90° Hybrid

  23. 90° Hybrid Results

  24. Lange Coupler Isolated Port Through Port Input Port Coupled Port

  25. Lange Coupler

  26. Lange Coupler

  27. Lange Coupler Results

  28. Overview • Objective • Background • Block Diagram • Tasks & Schedule • Results • MATLAB • Network Analyzer

  29. Questions? Check us out at: cegt201.bradley.edu/projects/proj2005/sixpna

  30. Calibration Work Calibration Flow Equations

  31. Calibration Work Calibration Flow Equations Part 2

  32. Calibration Work Calibration Flow Equations Part 3

  33. Measurement Work Measurement Equations

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